ong periods of time. Natural thorium is almost 100 % 232^Th, with half life of 1.405*10^10y. If an average lateen mantle contains 350mg of thorium what is its activity (in Bq)

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Given: The half life time of thorium is t1/2=1.405×1010 y. The mass of thorium in lantern is m=300…

Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…

A: Given: Mo=200 gM=23.0 gt=1 year = 365 days

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h1 (a) Calculate the…

A: Given(s): Decay constant, λ=0.0256 h-1 Require: Half-life, t12=? Fraction of sample left after,…

Q: The activity of a freshly prepared radioactive sample with a half-life of 4 days is 1000 Bq. How…

A: Given : t1/2 = 4 days No = 1000 Bq N = 250 Bq

Q: Consider a radioactive decay where the parent nucleus (1) decays into a daughter nucleus (2) which…

A:

Q: radioactive

A:

Q: 09:1 g of medium is reduced by 2.1 mg in 5 years by a-decay. Calculate the half life period of…

A: Given The initial mass of radiation Ao = 1g Mass of radiation left after 5 years (A) = 2.1 mg =…

Q: A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This…

A: The age of the rock is 1.36 x 10¹⁰  years

Q: If there are 20 mmol of the radioactive isotope 3H (half-life 12 years) at t = 0, how much 3H remain…

A: Initial concentration of radioactive element  is Half-life time is Find:(a) Concentration of at…

Q: (a) Write the equation for the decay of 232 Th by a single alpha particle. (b) Determine the energy…

A: To find :  equation of decay energy released  in this decay  percentage of thorium nuclei left…

Q: Material found with the body had a C-14 activity of about 0.215 Bq per gram of carbon, where the A0…

A: The half life is t1/2=5730 yrs

Q: If the age of Earth is 4.6 billion years, what should be the ratio of 206P6/238U in a…

A:

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Let original number of atoms = NoLet the number of atoms present after time "t" = N

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: Consider an initial amount of 708g of radioactive material with half-life h=3.2hdays. Use a…

A: Write the expression of radioactive degradation. N=N0e-t/t1/2

Q: 3065Zn decays via ββ+ and EC (electron capture).  Estimate the half-life of the fully ionized Zinc…

A: Zn-65 disintegrates by an electron capture to the 115keV excited level and by electron capture and…

Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…

A:

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: the sample must be due to radioactive decay. With all of this in mind, if we find that a rock…

A: This problem can be solved using radioactive decay concept.

Q: If the unit for atomic mass were defined so that the mass of 1H were exactly 1.000 000 u, what would…

A:

Q: Earth is about 4.6 billion years old. If 235U is 0.72% abundant today, what was the ratio of 235/238…

A: Given: The time period of earth formation t = 4.6 billion years. The ratio of the 235 and 238…

Q: The half-life of a radiotracer is 3 hr. (i) Determine the decay constant of the radiotracer, (ii)…

A: Given, half life of radio tracker is, t12= 3hr i) So decay constant is,  λ = ln2t12=ln23hr=0.23 hr-1…

Q: 40.12 A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a…

A: Let N denote the number of atoms of the radioactive substance A. Let t1/2 denote the half-life time…

Q: A radioisotope has a half-life of 5.00min and an initial decay rate of 8000 Bq. (1.) What will be…

A:

Q: A radioactive sample contains 1.55g of of an isotope with half a life of 3.8 days. How much of the…

A: Given data:  Original amount of substance (N0) = 1.55 g Half life (T1/2) = 3.8 days Time (t) = 11.4…

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A: Half life of C-14  T1/2= yearsinitial activity of sample A0= BqActivity of sample At = Bq

Q: The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: P239u is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of P239u present…

A: The formula for remaining nuclei in terms of half life  N=N012tt1/2

Q: A radioactive substance initially contains 20000 thorium Th230 isotype. How many of this radioactive…

A:

Q: an life of 7.2 days ay. Subsequently,

A: In general the radioactive elements decay into another radioactive element.  The first one is called…

Q: Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining…

A: The radioactive dating of rocks formed from cooled lava is determined by using parallel decay of…

Q: Cadmium-107 has a half life of 6.52 hours. If you start off with sample which has an activity of 1.0…

A: The reactivity of the sample after time t is given by:

Q: An ancient artifact is found to contain 240 g of carbon and has an activity of 479 decays/min. ▬…

A:

Q: A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much…

A: Given : t = 234 million years = 234 × 106 years m = 4.84 mg t1/2 = 4.47 × 109 y

Q: A particular rock is thought to be 260 million years old. If it contains 3.70 mg of 238U, how much…

A: The initial amount of substance is,

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Radioactivity